Have you rebooted Windows since installing the "USB gadget Ethernet" drivers? Try opening the Start.htm file in the MSDOS drive that gets created when you plug in the BBB, and navigating to the BBB webpage from that.
What image is on your BBB? some of them have had errors in the "top level" webpages that can be very frustrating when first starting out, if you are following this route to get started. Oops, just noticed your last comment after the screen grab, if it worked on your previous PC, odds are its a driver issue on your new PC. Try getting the latest Windows drivers from Beaglboard.org.